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When making a selection in Photoshop, you get the dimensions of your selection as a tooltip (at least in CC), and it's displayed in the info-box (Window > Info) when enabled. I often use this to measure elements or especially distances between elements.

Selection dimensions in Photoshop

Is it possible to enable these dimensions in Illustrator's info-box?

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My Illustrator Info Panel DOES show the dimensions of all selected objects. Could you be a little clearer? Maybe I'm missing what it is you specifically are after. –  Scott Apr 23 at 20:30
    
Ah, I mean specifically the selectionbox you make when dragging your cursor –  nvreez Apr 23 at 20:32
    
No you can't get that. Illustrator simply doesn't make selection "boxes" it merely reflects the cursor dragging. The "Selection" is the total of the objects within the drag. –  Scott Apr 23 at 20:33
    
I see.. Alright, thanks for the help though! (What should I do with this question if it's not possible?) –  nvreez Apr 23 at 20:38

1 Answer 1

up vote 2 down vote accepted

There's a key difference in the selection processes between Photoshop and Illustrator.

In Photoshop, everything is a pixel. The background, whether white, black, colored, or transparent are all pixels. So when you create a selection within Photoshop you are selecting those pixels as well as anything which may be visibly different than the background pixels.

In Illustrator, nothing is a pixel. There is no background. Illustrator shows a white page, but if you turn on the transparency grid (View > Show Transparency Grid) you'll see there is nothing there. Since Illustrator is not pixel-based, the transparent or non-existent background is never part of any selection.

How it's different with the cursor....

In Photoshop the cursor with any of the marquee tools shows you exactly what pixels are being selected. This is because everything is a pixel so everything must be counted in the selection drag.

In Illustrator there are no marquee tools (Lasso Tool doesn't count), so the cursor is merely visually reflecting where you are dragging for reference, but it's never actually selecting the area it's showing as reference. It only selects the objects the cursor touches or which are contained within the drag reference lines. It's not selecting the empty background pixels, because there are no pixels.

The Info Panel in Photoshop shows you the width and height of the selection because all those background pixels matter. The Info Panel in Illustrator shows you the total dimensions of all selected objects because there are no background pixels.

You can not get Illustrator to show you the width and height of a cursor drag primarily because the size of the cursor drag is largely irrelevant and has no actual correlation to the final selection size.

Ultimately it comes down to the core difference between a pixel-based application such as Photoshop and a vector-based application such as Illustrator.

If you need to know the size of a specific area within Illustrator, just draw a standard rectangle around the area and check the dimensions for that, then you can delete the rectangle. And if you're curious, no. There's no way to convert a rectangle to a selected area within Illustrator other than converting it to an artboard or crop marks.

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Thanks for the explanation. I understand the difference and my use-case is a bit trivial. I wanted to use it more as a quick measurement tool when spacing out elements that are snapping to a grid. The reason I had hopes for this function is because the info-box does actually show your cursor position (in the unit you use) –  nvreez Apr 23 at 21:06
    
But probably Transform panel could help you –  Ilan Apr 23 at 21:17
    
Transform, like the info panel will only show the total dimensions of selected objects. You can't transform the "empty" space in Illustrator. –  Scott Apr 23 at 21:40

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